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A new generation of mobile terminals, communicators and smartphones, designed for general public, are emerging from the mobile phone revolution. Their distinctive features include enhanced data capabilities and the ability to locate the user. These features make these new types of applications, location-based and location-aware services, suitable for mobile users. In addition to location-based information access they also provide excellent means for data collection about the mobile users themselves, yielding valuable dynamic and geographic personal data. This type of data has never been available to such an extent before. Availability of such data would result in new opportunities for potential users: in commerce, in the public sector and even for private use. It is also a great challenge to the information systems: in data collection, management and analysis. Privacy protection is maybe the most serious problem to be found in this context. The objective of this paper is to present the opportunities and challenges provided by dynamic geographic personal data in the context of emerging “location-aware” mobile networks. Here a new service is outlined in parallel with existing and planned location-based services. The new service, designed for collecting, managing and releasing dynamic geographic population data, is called Dynamic Geographic Data Service (DGDS).